Efeito de dietas líquidas à base de leite integral e, ou, subproductos de soja sobre algumas características relacionadas à digestao, em bezerros

This work was carried out to evaluate the effect of the whole milk (WM); commercial milk replace based on textured soybean protein (MRTSP); and 1: 1 mixture of whole soybean extract: whole milk (SE: WM) on the apparent digestibility of the dry matter (ADDM), of the crude protein (ADCP) and of the gross energy (ADGE), the nitrogen balance (NB), the gross energy retention (GER), the intestine absorptive capacity, the fecal dry matter content (FDMQ and abomasal digesta pH. Twelve Holstein-Zebu (H/ Z) crossbred calves with initial average age of 5 days and 37 kg of live weight were randomly allotted to three treatments: WM (n=3), MRTSP (n=4) e SE: WM (n=5), in three experimental phases. The diets were exclusively liquid in the phase I (from 22 to 44 day), supplemented with concentrate in the phase 2 (from 45 to 91 day) and solid (only concentrate) in the phase 3 (from 92 to 110 day). The ADDM, ADCP, ADGE, NB and FDMC were analyzed in a completely randomized design (CRD). For the abomasal digesta pH and xylose plasma levels a split-plot type designs, with treatments allocated in the plots and the collected times in the split-plots were used. The calves fed WM showed higher ADDM, ADCP, ADGE, NB, GER and intestine absorptive capacity, when compared with to those fed the commercial milk replace containing textured soybean protein. The use of equal parts of whole soybean extract: whole milk mixture showed intermediate results. There were no differences among diets for fecal dry matter and abomasal digesta pH.(RA)